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(No Model.) 2 Sheets-Sheet 1. E. WESTON.

ELECTRIC ARC LAMP.

No. 272,367. PatentedFeb. 13,1883.

.flziest: Inventor:

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2 Sheets-Sheet 2..

(No Model.)

H, WESTON.

ELECTRIC ARC LAMP.

Patented Feb. 13, 1883.

Inventor:

UNITED STATES PATENT @Errcr.

EDWARD \VESTON, OF NEWARK, NEW JERSEY, ASSIGNOR TO THE UNITED ,STATES ELECTRIC LIGHTING COMPANY, OF NETV YORK, N. Y.

ELECTRIC-ARC LAMP.

SPECIFICATION forming part of Letters Patent No. 272,367, dated February 13, 1883.

Application filed Scptembcrfii, 1882. (No model.)

To all whom it may concern:

Be it known that I, EDWARD \VESTON, a subject of the Queen of Great Britain,and aresident of Newark, in the county of Essex and State of New Jersey, have invented certain new and usefulImprovements in Electric-Arc Lamps, of which the following is a specification, reference being bad to the drawings accompanying and forming a part of the same.

My invention relates more particularly to clutch or clamp lampsthat is to say, lamps in which a gripping mechanism for the carbonholder is employed, in conjunction with asuitable system ofelectro-magnets; and it consists mainly in improvements in the character and disposition of the magnets andarmatures, whereby a better and cheaper lamp is or may be produced.

In the drawings hereto annexed, Figure 1 is a view in elevation of the upper portions of the feed mechanism of an electric lamp constructed in accordance with my invention, portions of the casing for containing the same, and the devices by means of which the lamp is 2 suspended. Fig. 2 is a plan view of the suspending and circuit-controlling devices; Fig. 3, a plan view of the feed-regulating mechanism; and Fig. 4, a side elevation of the mechanism employed, in conjunction with the lamp,

0 as a cut-out or safety device.

Similar letters of reference indicate corre sponding parts.

' The lamp-regulating mechanism is inclosed in a suitable casing, A, and is mounted on an 5 insulated plate, B. The casing A is clamped to a board, 0, containing terminal hooks DD, and surmounted by a tube, E, that covers the hole through which projects the carbon-holder. The constructi0n and special purposes of these 40 parts having been fully set forth in other applications by me made, a more detailed description is not given here.

On the plate Bis screwed a U-shaped stand ard or frame, F. From the sides extend the 5 short armsfand from its top extends an arm,

6, the character of these parts being like or substantially similar to that shown in the drawings.

To the arms ffa rectangular frame is pivoted, the said frame consisting of soft-iron side pieces, G G, and ends of brass or other nonmagnetic metal, r g.

On opposite sides of the frame F are secured electro-magnets, M being the main circuitand N the shunt-magnet, the cores of the two he ing parallel, and both are so placed that the sides G G of the pivoted frame will pass close in face of their poles.

A carbonholder passes through guides in frame F and plate B, and a suitable clutchsuch as a perforated plate, a, and tailpiece b, or any similar de\'iccsurrounds said carbonholder, and is hinged in proper manner to a bar, L, carried by the sides G G of the pivoted frame, or otherwise connected with a part of the said frame, capable of imparting to it the requisite movement.

A plate, H, is secured to the end of arm 0 by a slot and screw, and is bent over to form a step, It, for the end I) of the clutch. 0

A dash-pot, P, the piston-rod of which is hinged to the upper part of the casing, is connected with one end of the pivoted frame in substantiallythe manner shown in Fig. 1.

It will be readily perceived that the pivoted 7 frame and its appurtenances may be considerably modified withontdeparture from the spirit of the invention. For instance, the ends 9 9 may be dispensed with; or the sides G G may be fixed to arock-shaft, or other alterations of a like nature made, without materially affecting the result.

In conjunction with the board C, I employ for suspending the lamp a second board, 0, on which are screwed the plates 0 0, provided with means for engaging the suspending-hooks D 1), and connected with binding-posts dd. On the under side of the board 0 is also arranged a cut-out or safety device, (shown in detail in Fig. 4,) and consisting of a magnet, M, included in the main circuit of the lamp, a vibrating armature, a, contact stop or arm I, and a wire,

0, connecting one terminal of the lamp with the armature a, and containing a resistance,

R, equal to the combined resistance of the 5 magnet-coils of the lamp and the carbons.

The operation of thelamp is as follows: The current being directed through the lamp, the magnet M tilts the frame by its attraction for the sides G G, lifts the short arm of the clamp, 10o

a 2 tease? and separates the carbons. The magnet N, which 1s in the shunt-circuit around thelamp, may be wound in either direction; but the best results will be obtained by magnetizing it, so that its poles correspond with those of magnet M. In either case the magnet N acts in opposition to magnet M, and draws back the frame into a position to release the clutch when the arc lengthens. The special advantages which the described arrangement of magnets and armatures presents are that both ends of the cores are utilized, though both cores form really a part of the same magnetic system, since one of the sides G may be re arded as the connecting-piece, the other as the armature. In practice the lamp will be found extremely sensitive and its operation remarkably steady and uniform.

The operation of the cut-out is well understood. It the are in a lamp is interrupted permanently, as by the breaking of the carbons, the current will pass around the lamp in which the break occurs by the wire 0, armature a, and arm Z. The resistance It is used to divide the current when the armature a is down between the path just described and the coils of the magnet.

It may be stated that other forms of feed mechanism may be combinedwith the swing ing; or pivoted frame; but in practice I prefer that described.

What I claim as my invention is 1. In an electric lamp, the combination, with the carbons and mechanism for controlling the same, of a pivoted frame, the opposite sides of which constitute armatures, and electromagnets included respectively in the main and shunt circuits and placed between the sides of said frame on opposite sides of the pivotal points, substantially as hereinbefore described.

2. In an electric lamp, the combination, with fixed parallel cores wound with coils included respectively in the main and shunt circuits, of armature-bars pivoted so as to swing; in face of the opposite poles of said cores, and feedcontrolling mechanism connected with said bars and operated by the movement thereof", in substantially the manner set forth.

8. In an electric lamp, the combination, with the fixed magnets M and N, of the swinging or rocking frame composed essentially of iron side bars, Gr G, and non-magnetic end pieces, 9 g, the clutch u, the step or rest It, and carboncarrier, these parts being constructed and combined substantially in the manner set forth.

4-. In an electric lamp, the combination, with the upright frame or standard F, arm 0, and plate H, bent as described, of the armatures G G, pivoted to the standard, the magnets M. N, mounted between the armatures on opposite sides of the pivotal points, the bar L, the clamp to, and the gravita-ting; carbon-holder, these parts being constructed and combined in substantially the manner set forth.

In testimony whereof I have hereunto set my hand this 19th day of September, 1882.

. EDWARD WES'lTOIi-l.

Witnesses:

W. Fursev, PARKER W. Pan-s. 

